My betta fish appears to be sick, and I'm not sure what to do.
My fish is in a 1 gallon, filtered, heated tank. His temperature is kept at a steady 80 degrees, he also has an air stone. His water is changed and treated with a conditioner once a week, and he is fed freeze dried blood worms and also pellets (not all at once).
Recently I noticed some dull spots on his body so I began treating him with pimafix, he healed well and we moved on. However, all of a sudden he is now very lethargic, hovering toward the top of his tank, or resting on the stones on the bottom, and he has a red spot on his back. He still eats, he still swims around anxiously when I approach the tank but for the most part he just lays there.
Pimafix doesn't seem to be helping him anymore so I've been looking at adding aquarium salt, or possibly Lifeguard All-in-One Freshwater treatment. Any suggestions?